<template>
	<view class="uni-load-more" @click="onClick">
		<!-- #ifdef APP-NVUE -->
		<loading-indicator v-if="!webviewHide && status === 'loading' && showIcon"
			:style="{color: color,width:iconSize+'px',height:iconSize+'px'}" :animating="true"
			class="uni-load-more__img uni-load-more__img--nvue"></loading-indicator>
		<!-- #endif -->
		<!-- #ifdef H5 -->
		<svg width="24" height="24" viewBox="25 25 50 50"
			v-if="!webviewHide && (iconType==='circle' || iconType==='auto' && platform === 'android') && status === 'loading' && showIcon"
			:style="{width:iconSize+'px',height:iconSize+'px'}"
			class="uni-load-more__img uni-load-more__img--android-H5">
			<circle cx="50" cy="50" r="20" fill="none" :style="{color:color}" :stroke-width="3"></circle>
		</svg>
		<!-- #endif -->
		<!-- #ifndef APP-NVUE || H5 -->
		<view
			v-if="!webviewHide && (iconType==='circle' || iconType==='auto' && platform === 'android') && status === 'loading' && showIcon"
			:style="{width:iconSize+'px',height:iconSize+'px'}"
			class="uni-load-more__img uni-load-more__img--android-MP">
			<view class="uni-load-more__img-icon" :style="{borderTopColor:color,borderTopWidth:iconSize/12}"></view>
			<view class="uni-load-more__img-icon" :style="{borderTopColor:color,borderTopWidth:iconSize/12}"></view>
			<view class="uni-load-more__img-icon" :style="{borderTopColor:color,borderTopWidth:iconSize/12}"></view>
		</view>
		<!-- #endif -->
		<!-- #ifndef APP-NVUE -->
		<view v-else-if="!webviewHide && status === 'loading' && showIcon"
			:style="{width:iconSize+'px',height:iconSize+'px'}" class="uni-load-more__img uni-load-more__img--ios-H5">
			<image :src="imgBase64" mode="widthFix"></image>
		</view>
		<!-- #endif -->
		<text v-if="showText" class="uni-load-more__text"
			:style="{color: color}">{{ status === 'more' ? contentdownText : status === 'loading' ? contentrefreshText : contentnomoreText }}</text>
	</view>
</template>

<script>
	let platform
	setTimeout(() => {
		platform = uni.getSystemInfoSync().platform
	}, 16)

	import {
		initVueI18n
	} from '@dcloudio/uni-i18n'
	import messages from './i18n/index.js'
	const {
		t
	} = initVueI18n(messages)

	/**
	 * LoadMore 加载更多
	 * @description 用于列表中，做滚动加载使用，展示 loading 的各种状态
	 * @tutorial https://ext.dcloud.net.cn/plugin?id=29
	 * @property {String} status = [more|loading|noMore] loading 的状态
	 * 	@value more loading前
	 * 	@value loading loading中
	 * 	@value noMore 没有更多了
	 * @property {Number} iconSize 指定图标大小
	 * @property {Boolean} iconSize = [true|false] 是否显示 loading 图标
	 * @property {String} iconType = [snow|circle|auto] 指定图标样式
	 * 	@value snow ios雪花加载样式
	 * 	@value circle 安卓唤醒加载样式
	 * 	@value auto 根据平台自动选择加载样式
	 * @property {String} color 图标和文字颜色
	 * @property {Object} contentText 各状态文字说明，值为：{contentdown: "上拉显示更多",contentrefresh: "正在加载...",contentnomore: "没有更多数据了"}
	 * @event {Function} clickLoadMore 点击加载更多时触发
	 */
	export default {
		name: 'UniLoadMore',
		emits: ['clickLoadMore'],
		props: {
			status: {
				// 上拉的状态：more-loading前；loading-loading中；noMore-没有更多了
				type: String,
				default: 'more'
			},
			showIcon: {
				type: Boolean,
				default: true
			},
			iconType: {
				type: String,
				default: 'auto'
			},
			iconSize: {
				type: Number,
				default: 24
			},
			color: {
				type: String,
				default: '#777777'
			},
			contentText: {
				type: Object,
				default () {
					return {
						contentdown: '',
						contentrefresh: '',
						contentnomore: ''
					}
				}
			},
			showText: {
				type: Boolean,
				default: true
			}
		},
		data() {
			return {
				webviewHide: false,
				platform: platform,
				imgBase64: ''
			}
		},
		computed: {
			iconSnowWidth() {
				return (Math.floor(this.iconSize / 24) || 1) * 2
			},
			contentdownText() {
				return this.contentText.contentdown || t("uni-load-more.contentdown")
			},
			contentrefreshText() {
				return this.contentText.contentrefresh || t("uni-load-more.contentrefresh")
			},
			contentnomoreText() {
				return this.contentText.contentnomore || t("uni-load-more.contentnomore")
			}
		},
		mounted() {
			// #ifdef APP-PLUS
			var pages = getCurrentPages();
			var page = pages[pages.length - 1];
			var currentWebview = page.$getAppWebview();
			currentWebview.addEventListener('hide', () => {
				this.webviewHide = true
			})
			currentWebview.addEventListener('show', () => {
				this.webviewHide = false
			})
			// #endif
		},
		methods: {
			onClick() {
				this.$emit('clickLoadMore', {
					detail: {
						status: this.status,
					}
				})
			}
		}
	}
</script>

<style lang="scss" >
	.uni-load-more {
		/* #ifndef APP-NVUE */
		display: flex;
		/* #endif */
		flex-direction: row;
		height: 40px;
		align-items: center;
		justify-content: center;
	}

	.uni-load-more__text {
		font-size: 14px;
		margin-left: 8px;
	}

	.uni-load-more__img {
		width: 24px;
		height: 24px;
		// margin-right: 8px;
	}

	.uni-load-more__img--nvue {
		color: #666666;
	}

	.uni-load-more__img--android,
	.uni-load-more__img--ios {
		width: 24px;
		height: 24px;
		transform: rotate(0deg);
	}

	/* #ifndef APP-NVUE */
	.uni-load-more__img--android {
		animation: loading-ios 1s 0s linear infinite;
	}

	@keyframes loading-android {
		0% {
			transform: rotate(0deg);
		}

		100% {
			transform: rotate(360deg);
		}
	}

	.uni-load-more__img--ios-H5 {
		position: relative;
		animation: loading-ios-H5 1s 0s step-end infinite;
	}

	.uni-load-more__img--ios-H5 image {
		position: absolute;
		width: 100%;
		height: 100%;
		left: 0;
		top: 0;
	}

	@keyframes loading-ios-H5 {
		0% {
			transform: rotate(0deg);
		}

		8% {
			transform: rotate(30deg);
		}

		16% {
			transform: rotate(60deg);
		}

		24% {
			transform: rotate(90deg);
		}

		32% {
			transform: rotate(120deg);
		}

		40% {
			transform: rotate(150deg);
		}

		48% {
			transform: rotate(180deg);
		}

		56% {
			transform: rotate(210deg);
		}

		64% {
			transform: rotate(240deg);
		}

		73% {
			transform: rotate(270deg);
		}

		82% {
			transform: rotate(300deg);
		}

		91% {
			transform: rotate(330deg);
		}

		100% {
			transform: rotate(360deg);
		}
	}

	/* #endif */

	/* #ifdef H5 */
	.uni-load-more__img--android-H5 {
		animation: loading-android-H5-rotate 2s linear infinite;
		transform-origin: center center;
	}

	.uni-load-more__img--android-H5 circle {
		display: inline-block;
		animation: loading-android-H5-dash 1.5s ease-in-out infinite;
		stroke: currentColor;
		stroke-linecap: round;
	}

	@keyframes loading-android-H5-rotate {
		0% {
			transform: rotate(0deg);
		}

		100% {
			transform: rotate(360deg);
		}
	}

	@keyframes loading-android-H5-dash {
		0% {
			stroke-dasharray: 1, 200;
			stroke-dashoffset: 0;
		}

		50% {
			stroke-dasharray: 90, 150;
			stroke-dashoffset: -40;
		}

		100% {
			stroke-dasharray: 90, 150;
			stroke-dashoffset: -120;
		}
	}

	/* #endif */

	/* #ifndef APP-NVUE || H5 */
	.uni-load-more__img--android-MP {
		position: relative;
		width: 24px;
		height: 24px;
		transform: rotate(0deg);
		animation: loading-ios 1s 0s ease infinite;
	}

	.uni-load-more__img--android-MP .uni-load-more__img-icon {
		position: absolute;
		box-sizing: border-box;
		width: 100%;
		height: 100%;
		border-radius: 50%;
		border: solid 2px transparent;
		border-top: solid 2px #777777;
		transform-origin: center;
	}

	.uni-load-more__img--android-MP .uni-load-more__img-icon:nth-child(1) {
		animation: loading-android-MP-1 1s 0s linear infinite;
	}

	.uni-load-more__img--android-MP .uni-load-more__img-icon:nth-child(2) {
		animation: loading-android-MP-2 1s 0s linear infinite;
	}

	.uni-load-more__img--android-MP .uni-load-more__img-icon:nth-child(3) {
		animation: loading-android-MP-3 1s 0s linear infinite;
	}

	@keyframes loading-android {
		0% {
			transform: rotate(0deg);
		}

		100% {
			transform: rotate(360deg);
		}
	}

	@keyframes loading-android-MP-1 {
		0% {
			transform: rotate(0deg);
		}

		50% {
			transform: rotate(90deg);
		}

		100% {
			transform: rotate(360deg);
		}
	}

	@keyframes loading-android-MP-2 {
		0% {
			transform: rotate(0deg);
		}

		50% {
			transform: rotate(180deg);
		}

		100% {
			transform: rotate(360deg);
		}
	}

	@keyframes loading-android-MP-3 {
		0% {
			transform: rotate(0deg);
		}

		50% {
			transform: rotate(270deg);
		}

		100% {
			transform: rotate(360deg);
		}
	}

	/* #endif */
</style>
